body {
    height: 100vh;
    background-size: cover;
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
  }

  /* 主体 div 样式 */
  .container {
    background:-webkit-gradient(linear,left top,left bottom,from(#fff),to(rgb(41, 67, 143)),color-stop(1.5,rgb(156, 156, 215)));
    border-radius: 0.7rem;
    box-shadow: 0 0.9rem 1.7rem rgba(0, 0, 0, 0.25),
      0 0.7rem 0.7rem rgba(0, 0, 0, 0.22);
    height: 420px;
    max-width: 750px;
    overflow: hidden;
    position: relative;
    width: 100%;
  }
  /* 登录、注册框部分 */
  .container-form {
    height: 100%;
    position: absolute;
    top: 0;
    transition: all 0.6s ease-in-out;
  }

  /* 登录框 - 默认层级高 */
  .container-signin {
    left: 0;
    width: 50%;
    z-index: 2;
  }

  /* 注册框 - 默认层级低 - 透明度 0 */
  .container-signup {
    left: 0;
    opacity: 0;
    width: 50%;
    z-index: 1;
  }


  /* 表单样式 */
  .form {
    background:-webkit-gradient(linear,left top,left bottom,from(#fff),to(rgb(41, 67, 143)),color-stop(1.5,rgb(156, 156, 215)));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 3rem;
    height: 100%;
    text-align: center;
  }

  .form-title {
    font-weight: 300;
    margin: 0;
    margin-bottom: 1.25rem;
  }


  .link {
    color: #333;
    font-size: 0.9rem;
    margin: 1.5rem 0;
    text-decoration: none;
  }

  .input {
    width: 100%;
    background-color: #fff;
    padding: 0.9rem 0.9rem;
    margin: 0.5rem 0;
    border: none;
    outline: none;
  }


  .btn {
    background-color: rgb(41, 67, 143);
    box-shadow: 0 4px 4px rgba(175, 192, 238, 0.3);
    border-radius: 5px;
    color: #e7e7e7;
    border: none;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: bold;
    letter-spacing: 0.1rem;
    padding: 0.9rem 4rem;
    text-transform: uppercase;
    transition: transform 80ms ease-in;
  }

  .form>.btn {
    margin-top: 1.5rem;
  }

  .btn:active {
    transform: scale(0.95);
  }
  .btn a{
    color:#fff;
    font-size: 16px;
  }

  /* ---------- 叠加部分样式 ------------- */
  .container-overlay {
    height: 100%;
    left: 50%;
    overflow: hidden;
    position: absolute;
    top: 0;
    transition: transform 0.6s ease-in-out;
    width: 50%;
    z-index: 100;
  }

  .overlay {
    width: 200%;
    height: 100%;
    position: relative;
    left: -100%;
    background: url("img/zhuce.jpg") no-repeat center fixed;
    background-size: cover;
    transition: transform 0.6s ease-in-out;
    transform: translateX(0);
  }

  .overlay-panel {
    height: 100%;
    width: 50%;
    position: absolute;
    top: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    transform: translateX(0);
    transition: transform 0.6s ease-in-out;
  }

  .overlay-left {
    transform: translateX(-20%);
  }

  .overlay-right {
    right: 0;
    transform: translateX(0);
  }

  /* 设计激活时叠加层的位置 */
  .panel-active .overlay-left {
    transform: translateX(0);
  }
  .panel-active .container-overlay {
    transform: translateX(-100%);
  }
  .panel-active .overlay {
    transform: translateX(50%);
  }

  /* 设置激活时，登录注册层的位置和透明度 */
  .panel-active .container-signin {
    transform: translateX(100%);
  }
  .panel-active .container-signup {
    opacity: 1;
    z-index: 5;
    transform: translateX(100%);
  }
  .index{
      position: absolute;
      left: 370px ;
      top: 140px;
  }